Pile wire



N. H. FAIRWEATHER PILE wiRE Filed Feb. l0. 1923 SAFETY-RAZOR compartimos' Boeren, Massacre-esmas; .eli Genres-.Arroyos nai-3A- I wenn ".Appncatipnnied February i0, fleas.r seria1rN-0..e1s,so5.

' My invention relates to pile wires such as are used in-weaving Guti-pile Yfabrics' and have Adetachable blades, and,y isf particular-ly applicable. topile VAwires* which are Vof relatively small size and are thin inproportion to their-height, its object being to improve upon the means heretofore'` employed for holdingthe vdetachable blades in place in the wires. The features in which, my invention resides are hereinafter described in connection with the accompanying drawing, in whichvFigure 1 is a side elevation of a portion of a pile wire embodying my invention in its preferred form, showing the blade in place in the wire;

Figure 2 is a top ,plan View 0f the same portion ofthe wire, with the blade omitted; and

Figure 3 is a transverse section on the line' 3 3 in Figure l.

The construction illustrated in the vdrawing consists essentially of a pile wire 2 provided nearits free end with a longitudinallyextending recess 3 adapted to receive a removable blade and having side walls which are thin enough to yield slightly under a moderate pressure and are so'` spaced that` Vthey are ,forced apart by the insertion of the blade, with the result that the elasticity of the metal of which Vthe wire is made causes the sidewalls ofthe recess to eXert a frictional grip on the sides of the blade and thereby hold it in the recess. The form of blade preferably employed, shown at 4', is a flat-sided blade of substantially triangular shape with a straight lowerl edge and up-y wardly-converging front and Vrear edges, of which the rear edge 5 is the cutting edge. The recess 3 extends downward into the wire from its upper edge, and when the blade is in operative position therein lits lower edge is seated 0n the bottom of the recess e and its upper portion projects above the top of the wire, as shown in Figure l, with its rear edgeslanting downward and rearward .in the central plane `of the wire. j

The recess 3, in the form shown in the drawing, has a Vfiat bottom withupwardlycurving front and rear ends, due to the formation of the recess by means of a small Circular saw which is fed downward into the wire to the required depth and then 'traversed lengthwise thereof until a groove of .PILE wlan:

k the `desired length lis obtained.4 .The saw einployedis preferablvslightly thicker than theblade,"and after it hasbeen` withdrawn from the ,groove 'the'.side wallsof the recess vare pressed inward a few' "thousandths of an `near the front endof the recess and slightly aboveits bottom, in position to be engaged by the front edge of the blade. In case the blade has a slanting front edge, as shown, this stop 7v will evidently overhang the lower edge of the blade, with the result that any pressure exerted on the blade and tending to force it forward inthe wire will cause its rear end to hug the bottom of the recess and thus. effectively prevent any possible tendency of the blade to tilt in the recess.

In addition to the simplicity of the construction above described and its freedom from any opening in which'flights ofyarn may catch'it has the important advantage that blades differing in `length can be used with equalfacility, thereby avoiding the eX` pense involved in accurately constructing the'blades to Vstandard dimensions. Other advantages reside in the complete absence ofspecial locking devices orl moving parts of any sort for holding the blade in place, and in the facility with which the blade can be inserted andremoved, vwhichis accom-V plished Vby merelyfgrippingthe upper portion of the blade between-the jaws of a suitable tool, such asa pair of pliers, and then forcing it into or withdrawing it from the recess, as the case may be.

I claim:

l. A pile wire provided with a longitudinal recess terminating atf both ends within the wire and openlat the upper edge of the wire for the reception of a removable blade, said recess being bounded laterally. by resilientf walls which are integral with theV nal recess terminating at both ends within the Wire and open at the upper edge of the wire for the reception of a removable blade, said recess being longer than the blade and being bounded laterally by resilient Walls which are vintegral with the Wire and are so spaced as to exert a frictional retaining grip on the sides of the blade when inserted. in the recess, and a stop carried by the Wire in position to be engaged by the front edge of the blade. Y

3. A pile Wire provided with a longitudinal recess terminating at both ends Within the Wire and open at the upper edge of the 15 Wire for the reception of a removable blade,

said recess being bounded laterally by resilient Walls which are integral With the Wire and are so spaced as to eXert a frictional retaining grip Von the sides of the bladev When inserted in the recess, in combination with a blade havingupwardly converging front and rear edges and adapted to seat on the bottom of the recess, and a transversely-extending stop carried by the Wire n position to be engaged by the front edgeof the blade above the bottom of the recess. Y f

Signed at Boston, Mass., this Sthrday of February, 1922.V

NELSON H. FAIRVEATHER. 

